He came out to them about two years ago.
Koreaboo
Just now
JUST B‘s Bain has recently become the center of attention among K-Pop fans after he publicly came out as gay.

The fourth-generation star took a chance when he unexpectedly told the group’s LA concert audience that he is proudly “part of the LGBT community.” Since then, Bain has been in many headlines and even more social media posts.
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While we know the fans’ excited reactions to Bain’s sexuality, many were curious to know if his members had known before the concert moment, and if so, what their reaction had been. The 23-year-old K-Pop star quenched everyone’s curiosity in a recent interview with Dazed.
Bain says it all started when he confided in fellow member Geonu during a one-on-one conversation about his struggles with his identity. But it wasn’t until a group hangout that everything truly changed.
It’s been about two years since I came out to my members and the company. I first opened up to our member GEONU, sharing my struggles with my sexuality in a personal conversation. Later, there was a moment when all the members were together talking, and JIMIN – a friend of mine for nine years – suddenly asked me, ‘Bain, are you gay?‘.
— JUST B’s Bain

The conversation marked the beginning of a shift in his relationship with his members, a bond that would prove stronger than he expected.
He added that if I was, he hoped I wouldn’t feel the need to hide it and could speak freely and comfortably with them. I honestly had no intention of coming out that day, but somehow, JIMIN’s words gave me the strength to speak up and be honest about who I am.
— JUST B’s Bain
@justb_official I just wanna🕺 #JUSTB #저스트비 #임지민 #LIMJIMIN #배인 #Bain #송병희 #시우 #SIWOO #trend #foryou #fyp ♬ original sound – 🥓Bain then revealed the members’ reactions after finally coming out to them, and claimed that it was a huge comfort to him
The members accepted me with calmness and warmth, smiling and nodding as if they’d already known. I’m not sure if they were trying to hide their surprise in front of me, but that moment was a huge comfort for me.
— JUST B’s Bain

Bain emphasized that his decision to come out publicly came after very long contemplation, saying he wanted to speak from the heart when the time felt right. His story now is not just a personal milestone — it also marks a historic moment for K-Pop’s evolving relationship with LGBTQ+ identity.